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Figure 7 – HP StorageWorks XP Remote Web Console Software User Manual

Page 26

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Preparing for External Storage XP operations

NOTE:

When the external array is an EVA array, as you restore the path with the highest priority,

the I/O execution path switches back to the restored highest priority path. In this case, the status of

the path for which the status changed to Normal when the error occurred changes back to

Standby.

Figure 7

Alternate path mode is Single mode with alternate paths in Normal and Standby

NOTE:

External arrays with Asymmetrical Active/Active (AAA) controllers, such as the Hitachi

Thunder, are an example of

Figure 7

. A notable characteristic of using AAA controller arrays as

external storage is that paths to alternate ports on the owning controller for a given external LU are

seen as Normal status, but I/O load balancing does not occur (either across controllers or across

ports to the owning controller). Paths to the non-owning external controller’s ports are shown as

Standby status.

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